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The most common mutation in FKRP causing limb girdle muscular dystrophy type 21 (LGMD2I) may have occurred only once and is present in Hutterites and other populations

Lookup NU author(s): Emerita Professor Katherine Bushby, Professor Volker Straub

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Abstract

Limb girdle muscular dystrophy (LGMD) is common in the Hutterite population of North America. We previously identified a mutation in the TRIM32 gene in chromosome region 9q32, causing LGMD2H in approximately two-thirds of the 60 Hutterite LGMD patients studied to date. A genomewide scan was undertaken in five families who did not show linkage to the LGMD2H locus on chromosome 9. A second LGMD locus, LGMD2I, was identified in chromosome region 19q13.3, and the causative mutation was identified as c.826C>A (L276I), a missense mutation in the FKRP gene. A comparison of the clinical characteristics of the two LGMD patient groups in this population reveals some differences. LGMD2I patients generally have an earlier age at diagnosis, a more severe course, and higher serum creatine kinase (CK) levels. In addition, some of these patients show calf hypertrophy, cardiac symptoms, and severe reactions to general anesthesia. None of these features are present among LGMD2H patients. A single common haplotype surrounding the FKRP gene was identified in the Hutterite LGMD2I patients. An identical core haplotype was also identified in 19 other non-Hutterite LGMD2I patients from Europe, Canada, and Brazil. The occurrence of this mutation on a common core haplotype suggests that L276I is a founder mutation that is dispersed among populations of European origin. © 2004 Wiley-Liss, Inc.


Publication metadata

Author(s): Frosk P, Greenberg CR, Tennese AAP, Lamont R, Nylen E, Hirst C, Frappier D, Roslin NM, Zaik M, Bushby K, Straub V, Zatz M, De Paula F, Morgan K, Fujiwara TM, Wrogemann K

Publication type: Article

Publication status: Published

Journal: Human Mutation

Year: 2005

Volume: 25

Issue: 1

Pages: 38-44

Print publication date: 01/01/2005

ISSN (print): 1059-7794

ISSN (electronic): 1098-1004

Publisher: Wiley-Blackwell

URL: http://dx.doi.org/10.1002/humu.20110

DOI: 10.1002/humu.20110

PubMed id: 15580560


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